CN202586377U - Grid-connected inverter - Google Patents
Grid-connected inverter Download PDFInfo
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- CN202586377U CN202586377U CN 201220239001 CN201220239001U CN202586377U CN 202586377 U CN202586377 U CN 202586377U CN 201220239001 CN201220239001 CN 201220239001 CN 201220239001 U CN201220239001 U CN 201220239001U CN 202586377 U CN202586377 U CN 202586377U
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- combining inverter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The utility model belongs to a field of inverters in power electronic converting devices and specifically relates to a grid-connected inverter. The grid-connected inverter includes a DC/AC converter. An input side of the DC/AC converter is connected with a DC power source through a DC bus. An output side of the DC/AC converter is connected with an AC grid. The grid-connected inverter is characterized in that the DC bus is connected with an energy storage flywheel connected with the input side of the DC/AC inverter in parallel. According to the utility model, the service life of the complete machine of grid-connected inverter is prolonged on a base of stabilizing the power output.
Description
Technical field
The utility model belongs to the inverter field in the Technics of Power Electronic Conversion device, relates to combining inverter particularly.
Background technology
During the expression absolute quantity, " many " as herein described are meant greater than one.
Because the fossil energy worsening shortages in the whole world, the main developed country in the world all begins to pay attention to the utilization research of regenerative resource, and wherein, the distributed generation system of regenerative resources such as research solar energy, wind energy is significant.For example; In photovoltaic generating system, because the photovoltaic array power output is a smooth direct current, and the combining inverter power output presents periodically pulsing; Therefore in the existing two-stage type grid-connected system; The common instantaneous power that needs enough jumbo electric capacity to compensate DC/DC converter power output and DC/AC converter power output is poor between input DC/DC converter and the DC/AC converter, reduces the pulsation of photovoltaic array power output, improves the tracking effect of photovoltaic array maximum power point.For firm power output, need be on dc bus the enough jumbo electric capacity of parallel connection come the fluctuation of air blower of compensating power output.Therefore, the combining inverter in power fields such as large-sized photovoltaic generating, wind energy is because the capacity of electric capacity is very big; Usually need to use electrochemical capacitor, however electrochemical capacitor along with the increasing of operating time, electrolyte can slowly volatilize; Capacitance can slowly reduce, thereby influences filter effect, and it is all limited with capacity that electrochemical capacitor is withstand voltage; Operational temperature conditions is harsh, and useful life is limited, influences the complete machine useful life of combining inverter.
Summary of the invention
The purpose of the utility model is on the basis of firm power output, to prolong combining inverter complete machine useful life.
Provide a kind of combining inverter for this reason; Comprise the DC/AC converter, DC/AC converter input side is used for receiving DC power supply through dc bus, and DC/AC converter outlet side is used to receive AC network; It is characterized in that, on dc bus, be connected to and the parallelly connected accumulated energy flywheel of DC/AC converter input side.
When DC/AC converter input side power was higher than outlet side power, accumulated energy flywheel changed into kinetic energy with electric energy and stores; When DC/AC converter outlet side power is higher than input side power, accumulated energy flywheel will discharge the kinetic energy of being stored, the electric energy supplement supply.Accumulated energy flywheel has the energy storage density height, power is big, efficient is high, the life-span is long, pollution-free, working environment adaptability by force, is not is not discharged and recharged number of times restriction, advantage such as safe and reliable, have powerful power-balance ability.The utility model adopts accumulated energy flywheel to replace dc-link capacitance, has realized the input power of DC/AC converter and the equilibrium,transient of power output, has played buffering energy and the effect of supporting DC bus-bar voltage; Stablized power output, overcome electrochemical capacitor and increased the defective that electrolyte can slowly volatilize and cause capacitance to reduce gradually along with the operating time; Low to the ambient temperature requirement, anti-overload ability is strong, and is pollution-free; Environmental protection has prolonged useful life of combining inverter complete machine.
As the preferred combining inverter of the utility model, also be provided with the input DC/DC converter that is used for conversion DC power supply output voltage, input DC/DC converter input side is used to receive DC power supply, and input DC/DC converter outlet side is received dc bus.Accumulated energy flywheel has been realized the equilibrium,transient of power output of power output and the DC/AC converter of input DC/DC converter, has stablized power output, has played the effect of buffering energy and support DC bus-bar voltage.
Description of drawings
Fig. 1 is the operation principle block diagram of the combining inverter of single-stage mapped structure.
Fig. 2 is the operation principle block diagram of the combining inverter of Two Stages structure.
Fig. 3 is the operation principle block diagram of the combining inverter of another single-stage mapped structure.
Fig. 4 is the operation principle block diagram of the combining inverter of another Two Stages structure.
Fig. 5 is an operation principle block diagram of concentrating the contravariant combining inverter.
Fig. 6 is the operation principle block diagram of common dc bus distribution parallel inverter combining inverter.
Fig. 7 is the operation principle block diagram of the combining inverter of distribution parallel net type.
Embodiment
Combining inverter among Fig. 1 is the single-stage mapped structure; Comprise DC/AC converter 2; DC/AC converter 2 input sides are received DC power supply 1 through dc bus, and DC/AC converter 2 outlet sides are received AC network, on dc bus, are connected to the accumulated energy flywheel 3 parallelly connected with DC/AC converter 2 input sides.
Combining inverter among Fig. 2 is the Two Stages structure; It is provided with the input DC/DC converter 4 that is used for conversion DC power supply 1 output voltage on the basis of Fig. 1; Input DC/DC converter 4 input sides are used to receive DC power supply 1, and input DC/DC converter 4 outlet sides are received dc bus.
Like Fig. 3 or Fig. 4, can between accumulated energy flywheel 3 and dc bus, be connected to the two-way DC/DC converter 5 that is used for the two-way changing direct voltage.
Combining inverter among Fig. 5 is for concentrating contravariant; Input DC/DC converter 4 comprises a plurality of son arranged side by side input DC/DC converters; Each height input DC/DC converter input side is used for connecting side by side a plurality of DC power supplys 1, and each height input DC/DC converter outlet side is aggregated into dc bus.
Combining inverter among Fig. 6 is for being total to dc bus distribution parallel inverter; DC/AC converter 2 comprises a plurality of sub-DC/AC converters arranged side by side; Each sub-DC/AC converter input side connects dc bus side by side, and each sub-DC/AC converter outlet side is used for receiving side by side AC network.Ac bus can be single phase alternating current (A.C.) bus or three-phase alternating current bus.
Combining inverter among Fig. 7 is the distribution parallel net type, and it is connected into ac bus simultaneously by a plurality of inverter structures as shown in Figure 2, and ac bus is connected with electrical network, and ac bus can be single phase alternating current (A.C.) bus or three-phase alternating current bus.
Among each figure, DC power supply 1 can be direct voltage source, DC current source, energy storage device or renewable energy power generation device, and accumulated energy flywheel 3 can be a magnetically levitated flywheel.
Below only be the preferred embodiment of this patent, equivalent technical solutions on this basis still falls into scope of patent protection.
Claims (7)
1. combining inverter; Comprise the DC/AC converter, DC/AC converter input side is used for receiving DC power supply through dc bus, and DC/AC converter outlet side is used to receive AC network; It is characterized in that, on dc bus, be connected to and the parallelly connected accumulated energy flywheel of DC/AC converter input side.
2. combining inverter according to claim 1; It is characterized in that; Be provided with the input DC/DC converter that is used for conversion DC power supply output voltage, input DC/DC converter input side is used to receive DC power supply, and input DC/DC converter outlet side is received dc bus.
3. combining inverter according to claim 1 and 2 is characterized in that, between accumulated energy flywheel and dc bus, is connected to the two-way DC/DC converter that is used for the two-way changing direct voltage.
4. combining inverter according to claim 2; It is characterized in that; Input DC/DC converter comprises a plurality of son arranged side by side input DC/DC converters; Each height input DC/DC converter input side is used for connecting side by side a plurality of DC power supplys, and each height input DC/DC converter outlet side is aggregated into dc bus.
5. combining inverter according to claim 4; It is characterized in that; The DC/AC converter comprises a plurality of sub-DC/AC converters arranged side by side, and each sub-DC/AC converter input side connects dc bus side by side, and each sub-DC/AC converter outlet side is used for receiving side by side AC network.
6. combining inverter according to claim 1 is characterized in that, said DC power supply is direct voltage source, DC current source, energy storage device or renewable energy power generation device.
7. combining inverter according to claim 1 is characterized in that, said accumulated energy flywheel is a magnetically levitated flywheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220239001 CN202586377U (en) | 2012-05-25 | 2012-05-25 | Grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220239001 CN202586377U (en) | 2012-05-25 | 2012-05-25 | Grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202586377U true CN202586377U (en) | 2012-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220239001 Expired - Lifetime CN202586377U (en) | 2012-05-25 | 2012-05-25 | Grid-connected inverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN202586377U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602609A (en) * | 2017-01-13 | 2017-04-26 | 北京群菱能源科技有限公司 | Device and method for suppressing DC bus voltage fluctuation in grid-connected circuit |
| CN106998154A (en) * | 2017-04-07 | 2017-08-01 | 北京群菱能源科技有限公司 | A kind of DC/AC converters |
| CN116454937A (en) * | 2023-06-12 | 2023-07-18 | 国电投坎德拉(北京)新能源科技有限公司 | Control method, system, controller and medium of grid-connected power generation system |
-
2012
- 2012-05-25 CN CN 201220239001 patent/CN202586377U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602609A (en) * | 2017-01-13 | 2017-04-26 | 北京群菱能源科技有限公司 | Device and method for suppressing DC bus voltage fluctuation in grid-connected circuit |
| CN106998154A (en) * | 2017-04-07 | 2017-08-01 | 北京群菱能源科技有限公司 | A kind of DC/AC converters |
| CN116454937A (en) * | 2023-06-12 | 2023-07-18 | 国电投坎德拉(北京)新能源科技有限公司 | Control method, system, controller and medium of grid-connected power generation system |
| CN116454937B (en) * | 2023-06-12 | 2024-01-09 | 国电投坎德拉(北京)新能源科技有限公司 | Control method, system, controller and medium of grid-connected power generation system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |
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| CX01 | Expiry of patent term |